From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CFC3938BAA for ; Mon, 9 Oct 2023 16:13:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jglOqobK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD579C433CD; Mon, 9 Oct 2023 16:13:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696868002; bh=6esODMROiEUAG3o4Hex9vmjCeAWOCXMNiQfNG9mTDI8=; h=Date:Subject:To:References:Cc:From:In-Reply-To:From; b=jglOqobKWYiSTk54wn2gqkfHiAKOCgq0FHr5ufRmyT1yn6KvXi795GQ/MLX8hfscD /ra6RfB9reOt9D4o3PL9gvPnvXLgwPsxFFDnrx+Y75z2vUJ2YalOndfxlJEwppRwzf 29au1NfhFW2V6S3AJRuHfUlDJ3N2xswqs7WoDdcK7oPc0sJVjPrQWs9/CUs2FrMc5H VrsmPJZ8EU2yd4ZTndR7yN8t+c0Xtsv2kP5SNJGXyx+qeIaLD9LV/7hznuuDzieUUV JgRzVHEfgSlWM7R9VOzz5teiHYz9Gj+nNjCfQMvltJfe7fX7PRsAz6iP7vIMiYutn3 IilDFgukMLlQg== Message-ID: <76f31a37-16b4-4e3a-8b00-fdb2c1eabfb4@kernel.org> Date: Mon, 9 Oct 2023 18:13:19 +0200 Precedence: bulk X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH mptcp-next v12 1/5] mptcp: avoid resetting when another subflow available Content-Language: en-GB, fr-BE To: Geliang Tang , mptcp@lists.linux.dev References: <2b69fa22510db02a12eb101c3e8173dda76f8133.1696831239.git.geliang.tang@suse.com> Cc: Paolo Abeni From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Geliang, On 09/10/2023 08:02, Geliang Tang wrote: > When closing the msk->first socket in __mptcp_close_ssk(), if there's > another subflow available, it's better to avoid resetting it. > > Signed-off-by: Geliang Tang > --- > net/mptcp/protocol.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c > index 30e0c29ae0a4..6346a164ed66 100644 > --- a/net/mptcp/protocol.c > +++ b/net/mptcp/protocol.c > @@ -2396,7 +2396,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, > goto out_release; > } > > - dispose_it = msk->free_first || ssk != msk->first; > + dispose_it = msk->free_first || ssk != msk->first || !list_is_singular(&msk->conn_list); > if (dispose_it) > list_del(&subflow->node); > > @@ -2446,7 +2446,7 @@ static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, > > sock_put(ssk); > > - if (ssk == msk->first) > + if (ssk == msk->first && list_is_singular(&msk->conn_list)) > WRITE_ONCE(msk->first, NULL); I don't think we should 'dispose it' nor set 'msk->first' to NULL but instead, we should not call tcp_disconnect() directly: if the connection is still in ESTABLISHED, tcp_disconnect() will send a RST if I'm not mistaken. That's what we want to avoid, no? Cheers, Matt -- Tessares | Belgium | Hybrid Access Solutions www.tessares.net